Stitching and trimming machine



April 19, 19%. J. D. KARLE STITCHING AND TRIMMING MACHINE SWIM/M cfoizvn 0. Marie llllllllllllllllllllllllll llll Filed May 26, 1954 April 19, 1938. J. D. KARLE STITCHING' AND TRIMMING MACHINE 4 Sheets-Sheet 2 Filed May 26, 1934 /zn 19. [Karla 1938. .J. D. KARLE STITCHING AND TRIMMING MACHINE Filed May 26, 1934 4 Sheets-Sheet 3.

v Ap 19, 1933. J. D. KARLE 2,114,962

S TITCH ING AND TRIMMING MAQHINE Patented Apr. 19, 1938 UNETED STATES PATENT OFFEE s'rrronmo AND TRIMMING MACHINE Application May 26, 1934, Serial No. 727,645

r 16 Claims.

This invention relates to sewing machines and more particularly to a sewing machine for simultaneously stitching and trimming material.

The several features of the present invention will be clearly understood from the following description and accompanying drawings in which:

Figure 1 is a front elevation, partly in section, of a sewing machinehavirig my improved trimming mechanism embodied therein.

Figure 2 is a side elevation of the sewing machine'head and trimming mechanism as viewed from the left in Figure 1.

Figure 3 is a plan sectional view on the line 3-3 of Figure l.

Figure 4 is a sectional view taken along the line 5-4 of Figure 3.

Figure 5 is a. sectional View taken substantially along the 1ine 5- 5 of Figure 2.

"Figure ,6 is a disassembled perspective view of the cutting wheel and the parts used to secure it to} its. actuating means.

Figures '7, 8 and 9 are sectional views taken along the lines ll, B-8 and 9-9, respectively, of Figure 3. v

Figure 10 is a vertical sectional view of a modification of the anvil roller and Figure 11 is a side elevation as viewed from the left of Figure 10.

As shown, my improved trimming or pinking mechanism is incorporated in the well known Singer 95 Class machine; This machine comprises a bed I6, a standard ll rising therefrom, and an overhanging bracket-arm i2 terminating in a hollow head 13. Journaled in suitable bearings in the bracket-arm I2 is 'a main shaft M which carries atvits forward end the needle-bar and take-up operating cranks l5, l5, respectively. The needle-bar crank is connected by means of the usual link ii to the needle-bar l8 which carries the eyes-pointed needle H8.

The main-shaft It carries the usual balancewheel 29 and securedto the shaft M is a bevelgear 2| which meshes with a gear 22 on the upper end of the vertical shaft 23 carrying at its lower end the bevel-gear 24 which meshes with the gear 25 on the loop-taker actuating shaft 26 which carries the loop-taker 2i and is journaled in bearing lugs l9 and 19 below the bed ill.

The feeding mechanism is of the usual construction and comprises the feed-lift eccentric 28 and feed-advancing eccentric 28 which, through the pitmans 351, 3G, operate the feed-lift rockshaft 32 and feed-advancing rock-shaft 32.

The elements comprising the feeding adjusting mechanism for varying the throw of the feeddog are of ordinary construction and, as herein illustrated, comprise a bell-crank lever 29 pivotally secured to a boss on the standard of the machine by a pivot-pin '29. One leg of the bellcrank lever 29 is provided with a hand-piece 29 and the other leg 29 is pivotally secured to a link 3| whichis secured to pitman 39 by the pivotscrew 33. This construction is old and well known and is shown in the patent to Cox, 1,062,696, dated May 27, 1913.

The feed-lift rock-shaft 32 has fixed thereto an arm 3 carrying a pin 35 which enters a U- shaped slot in one end of the feed-bar 36 which carries the feed-dog 38. The other end of the feed-bar is connected by means of a pivot-screw 3i to an arm 38 carried by the feed advancing rock-shaft 32. I

Fixed to the main-shaft M is an eccentric 39 encircles by a block 38' which is embraced by the bifurcated end id of a bell-crank lever (H. The lever it is pivoted for rocking movement on a pivot-pin t2 carried by the lug 43 fixed to the head IQ of the machine. The end 44 of the lever 4! is bifurcated. to receive the square block 45 which is carried by a pivot-screw 46 fixed to an arm 4'! which is secured to a short shaft it journaled in the rearwardly extending arms 69 of a frameiii.

The frame 59 is adjustably secured to the bed of the machine by the downwardly extending projections 53 and 53' which dovetail with the ears 52 of the block 52 secured to the bed of the machine by the screws 5! (Figs. 2 and 9). It will be obvious from the foregoing that the frame 58 maybe shifted longitudinally of the block 52 in order to move the frame Ell closer or nearer the stitch-forming mechanism. To hold the frame 50 in its adjusted longitudinal position on the slide-block 52, I have provided a shouldered screw 55 which extends through a suitable aperture in the projection 53 of the frame 59 and is threaded into a locking block 56 (Fig. 9). When the screw 55 is tightened the inclined side 57: of the block 56 is clamped against the ear 52' of the supporting slide-block 52, thereby frictionally clamping the frame 56 in its desired position.

Fixed to the shaft 48 is an arm 59 formed with a projection iii and a T-shaped slide-way in which is fitted a slide-block 68 formed with a pivotstud 62. The block 60 is apertured and tapped to receive the threaded end of the adjustment screw 63 which is formed with shoulders E i and 55 located on opposite'sides of the projection 61 on the arm 59.

Carried by the stud 62 and slidable therewith is anindicator element 66 and a flanged bushing 5? which extends through a slot 68 in the arm 59 and is held on the stud 62 by the knurled headed nut "I9.

The arm 69 is fixed by the screws 'II to a driving clutch member 2 which is freely rotatable on the shaft 13 and supported thereby. The clutch-member '52 is formed with three spaced projections 74- the outer faces of which are curved so as to fit freely within the driven cylindrical clutch member E5 which is fixed to the shaft I3 by the screws 75. Between the projections It are cut-away parts forming pockets for the gripping rollers I8. One face of each of the projections '54 is formed with a pocket in which a spring I! is located having one of its ends re-acting against the bottom of the pocket and its other end re-acting against a plunger I8 which contacts one of the rollers 16 and forces it outwardly.

To prevent retrograde or backward movement of the clutch-member I5 and shaft I3 when the clutch-member I2 is moved in a direction opposite to the arrow shown in Fig. 4, I have provided a clutch-holding member I9 similar in construction to the driven clutch-member I2. To secure the clutch-holding member I9 against rotation there is secured to the member I9 by the screws a bracket BI having laterally extending feet 82 which are adjustably fixed to the bed I 0 of the machine by the means of the screws 84 entering the slots 83. The shaft I3 is freely rotatable in the clutch-member 79 which is formed with chambers in which the rollers 85 are located and spring-pressed plungers B6 are provided for forcing the rollers outwardly. The driving clutch and holding clutch are similarly disposed relative to the shaft E3 and, therefore, when the driving clutch is moved in the direction of the arrow in Fig. 4, the rollers I6 move outwardly and grip the driven element '55 causing it to move with the driving member, when the driven element I5 is thus turned the rollers 85 of the locking clutch move inwardly towards the holding member I9 to permit the element I5 to turn freely. When the driving clutch member is moved in a direction opposite to the arrow in Fig. 4 the rollers '76 will be moved inwardly out of driving contact with the element I5 and any tendency to turn the element 75 in this direction will be prevented by the rollers 85 of the holding clutch.

The driven element I5 is fixed to the shaft I3 by the screws I5 and this shaft is journaled in an adjustable eccentric bushing 88 carried by the frame 5:]. The bushing 88 is formed with a flange portion 89 provided with suitable openings 89' for the purpose of turning the bushing relative to the frame. To hold the bushing 88 in its adjusted position a portion of the frame 50 is split and a clamping screw 99 draws the split portion tightly about the bushing.

The shaft I3 is provided with a centrally located aperture 9I which extends longitudinally of the shaft and the end of the shaft is formed with a cylindrical projection and a rib 92. The cylindrical projection 95 extends through the aperture 96 in a locking disc 94 and the rib 92 is received by the diametrical recess 93. A cutting or pinking wheel 97 having a centrally located aperture 98 which receives the cylindrical projection 95 is held on the end of the shaft I3 by the headed bolt 99 which extends through the longitudinal aperture 9| in the shaft 73 and is held therein by a nut I00. The bolt 99, cutting wheel and disk 94 are all locked in driving relation with the shaft I3 by means of a pin I III which extends through suitable apertures I02 and I62 in the cutting wheel and locking disk.

The cutting wheel 91 cooperates with a platen or anvil roller located below the bed of the machine and having its outer periphery extending through a suitable opening in the throat-plate I93 to a position in which the outer periphery of the roller is in substantially the same horizontal plane as the upper-face of the throatplate. The anvil roller comprises an outer racemember I54 and an inner race-member I05 with a series of anti-frictional elements I96 therebetween. Disks IBI are provided for retaining grease in and to prevent foreign materials from entering the raceway. The inner race-member IE5 is carried by the headed bushing I08 in which the loop-taker actuating shaft 26 is journaled.

In order to bring the trimming mechanism close to the stitch-forming mechanism, the outer race-member I5 is formed with an extension Hid which overhangs and partially surrounds the loop-taker 2?. To support the overhang of the ring Iii-i, I have provided two standard ball-bearings 599 which are secured by the screws III] to the reduced and offset ends III of the studs H2 rotatably carried by the bearing lug I9 and secured thereto by nuts II3. It will be obvious from the foregoing that the nuts I I3 may be loosened and the studs I I2 turned in order to adjust the ball-bearing I99 relative to the outer surface of the race-member IBM.

In Figures 10 and 11, I have shown a modification of the platen roller. As shown, the cutting element which cooperates with the cutting wheel comprises a ring I I5 which encircles the loop-taker 2'1. The inner face of the ring H5 is formed with a strengthened shoulder II 6 to prevent undue distortion. The ring is supported on anti-frictional bearings II! each of which comprises two standard ball-bearings IIQ held between two washers I20 on the reduced and offset end I23 of the stud I22 by the screws IZI. The studs E22 are supported by the bearing lug I8 and are held therein by the nuts I24. It will be obvious that the nuts I2 3 may be loosened and the studs turned to adjust the anti-frictional bearing II'I relative to the cutting wheel 9'! in order to adjust the ring H5 relative to the cutting wheel. The washers I20 have a larger diameter than the roller-bearings II 9 and therefore extend beyond the outer periphery of the ball-bearing to prevent lateral movement of the ring H5.

Operation When the machine is operated, the cam 39 oscillates the bell-crank lever 4I about its pivot 42, and the lever 4|, through the arm 4'1, oscillates the shaft 48 in its hearing. The oscillatory movement of the shaft 48 imparts an up and down vibratory motion to the lever 69 by means of the arm 59 and pivot-stud 62. The vibratory motion of the lever 59 through the one-Way clutch imparts an intermittent rotary movement to the driven clutch-member 75 and shaft I3 which carries the cutting wheel 91. The cutting Wheel is intermittently rotated in a clockwise direction as viewed in Figure 2 and it will be understood that the cam 39 and the actuating mechanism are so arranged as to synchronize the movement of the cutting wheel with the feed-dog.

The amount of rotary movement given the cutting wheel 9? may be varied by loosening the nut I8 and then rotating the shouldered adjust ing screw 63 which moves the sliding block 60 and stud 62 longitudinally of the arm 59 to vary the vibratory movement of the lever 69. I When the feeding mechanism is adjusted to vary the throw of the feed-dog it is also necessary to adjust the vibratory movement of the lever 69 to vary the rotary movement of the cutting wheel. To facilitate the making of these adjustments so that the feed-dog and cutting wheel will feed the material the same amount between successive needle reciprocations I have provided the feed.- adjusting hand-piece 29 with an indicator I and the standard of the machine with a plate I26 having .graduations thereon which correspond to the graduations 66 on the arm 59. By simply placing the indicators 66 and I25 at corresponding points on the graduated plates the feed-dog and cutting wheel feed the material the same distance simultaneously.

If it is desired to move the cutting wheel towards or away from the needle the thumb-screw 55 and the screws 84 are loosened and the entire assembly shifted longitudinally of the bracket 52, the block 5 and pivot-pin 43 being of suflicient length to permit this adjustment.

It will be obvious that by loosening the screw 90 the eccentric bushing 88 may be turned in the frame 50 to adjust the cutting wheel relative to the platen roller or ring.

While I have shown and described my invention applied to a lock-stitch machine of the :0- tary hook type, it may readily be applied to other types of machines.

From the foregoing description considered in connection with the accompanying drawings, the construction, manner of operation and several advantages of my improved stitching and pinking machine will be clearly and fully understood. It is apparent that such a machine has a wide variety of uses, and it will be understood that the form, construction and arrangement of the elements employed may be varied. Therefore, the privilege is reserved of resorting to- .all such legitimate changes therein as may be fairly embodied within the spirit and scope of the appended claims.

Having thus set forth the nature of the invention, what I claim herein is:-

l. The combination with a sewing machine having a work--suppcrt, a reciprocatory needle located above the work-support and a loop-taker located below the work-support and cooperating with said needle to form stitches, of a cutting wheel rotatably supported above said work-support, means for actuating said cutting wheel, a ring having a substantially uniform size of opening and its outer periphery extending through an opening in said work-support and cooperating with said cutting wheel to sever material, and supporting means for said ring, said supporting means being located below and engaging the outer periphery of the ring which extends through the opening.

2. The combination with a sewing machine having a work-support, a reciprocatory needle located above the work-support and a rotary hook located below the work-support and cooperating with said needle to form stitches, of a cutting wheel rotatably supported above said work-support, means for actuating said cutting whee-l, a ring encircling said rotary hook and having its outer periphery extending through an opening in said work-support and cooperating with said cutting wheel to sever material and a plurality of antifrictional elements for rotatably supporting said ring, said cutting wheel,

ring and anti-frictional elements being disposed in substantially the same vertical planes.

3. In combination with a sewing machine having a reciprocatory needle-bar, a rotatably supported cutting wheel, means for actuating said wheel, a ring having its outer periphery cooperating with said cutting wheel to sever material, and means for rotatably supporting said ring at spaced points on its outer periphery and substantially inthe vertical plane of the cutting wheel.

4. In combination with a sewing machine having a reciprocatory needle-bar, a rotatably supported cutting wheel, means for actuating said wheel, a ring having its outer periphery cooperating with said cutting wheel to sever material, means for rotatably supporting said ring at spaced points on its outer periphery, and means for adjusting said ring relative to said cutting wheel.

5. In combination with a sewing machine having a reciprocatory needle-bar, a rotatably supported'cutting wheel, means for actuating said wheel, a ring having its outer periphery cooperating with said cutting wheel to sever material, means for rotatably supporting said ring at spaced points on its largest diametrical peripheral portion, and means for adjusting said cutting wheel relative to said ring.

6. In combination with a sewing machine having a reciprocatory needle-bar, a cutting wheel, means for actuating said cutting wheel, a circular member cooperating with said cutting wheel to sever material and means for supporting said member at spaced points on its outer periphery, said cutting wheel, circular member and supporting means being disposed in substantially the same vertical plane.

7. In combination with a sewing machine having a reciprocatory needle-bar, a cutting wheel, means for actuating said cutting wheel, a circular'member cooperating with said cutting wheel to sever material and anti-frictional elements engaging the outer periphery of the member at its largest diametrical peripheral portion for rotatably supporting said member.

8. In combination with a sewing machine having a work-support, a reciprocatory needle located above said work-support, a loop-taker cooperating with said needle to form stitches and located below said work-support, a cutting wheel rotatably supported above said work-support, means for actuating said cutting wheel, a member encircling said loop-taker and having its outer periphery cooperating with said cutting wheel to sever material, and means engaging the outer periphery of the member at its largest peripheral portion for rotatably supporting said member.

9. In combination with a sewing machine having stitch-forming and feeding mechanism including a four motion feed-dog, a cutting wheel, means for imparting intermittent motion to said cutting wheel, means for synchronizing the movement of said cutting wheel with the movement of said feed-dog, a circular member co.- operating with said cutting wheel to sever material and means for rotatably supporting said member at spaced points on its outer periphery and at its largest peripheral portion.

10. In combination with a sewing machine having a reciprocatory needle-bar, a cutting Wheel, means for actuating said cutting wheel, a ring cooperating with said cutting wheel to sever material, and antifrictional means below the diametrical center line of the ring for rotatably supporting said ring, said cutting wheel, ring and anti-frictional means being disposed in substantially the same vertical plame.

11. In combination with a sewing machine having a work-support, a reciprocatory needle located above said work-support, a loop-taker cooperating with said needle to form stitches and located below said work-support, a cutting wheel rotatably supported above said work-support, means for imparting a step-by-step movement to said cutting wheel, a ring encircling said looptaker and cooperating with said cutting wheel to sever material and antifrictional elements located substantially in a vertical plane containing the cutting wheel below the diametrical center line of the ring for rotatably supporting said ring.

12. In combination with a sewing machine having a work-support, .a reciprocatory needle located above said work-support, a loop-taker cooperating with said needle to form stitches and located below said work-support, a cutting wheel ro'iataby supported above said work-support, means for imparting a one-way intermittent motion to said cutting wheel, a ring having its outer periphery cooperating with said wheel to sever material, means below the diametrical center line of the ring and in substantially the same vertical plane as the cutting wheel for rotatably supporting said ring, and means for holding said ring against lateral movement.

13. A sewing machine having in combination a work-support, an overhanging bracket-arm rising from said work-support, a needle-bar actuating shaft journaled in said overhanging arm, a needle-carrying bar actuated thereby, a looptaker located below the work-support, a frame fixed to said work-support, a shaft journaled in said frame, a rotary cutting wheel carried by said shaft, a one-way clutch carried by said shaft, a cam carried by the needle-bar actuating shaft, a bell-crank lever actuated by said cam and means connecting said bell-crank lever with said one-way clutch, said bell-crank lever and said last-named means being disposed in rear of the overhanging bracket-arm.

14. A sewing machine having in combination a bed formed with a bearing lug, a bushing carried by said lug and having a portion extending therefrom, a shaft journaled in said bushing, a loop-taker secured to said shaft, a ball-bearing carried by the extending end of said bushing, said ball-bearing comprising an inner race memher, an outer race member formed with a portion which overhangs the loop-taker, and a series of balls interposed between said members, antifrictional elements disposed beneath the outer race member and engaging the outer periphery of the member directly below the overhanging portion, a cutting wheel cooperating with the periphery of the outer race member, and means for imparting a step-by-step movement to said cutting wheel.

15. A sewing machine having in combination, sewing instrumentalities including a reciprocatory needle and a rotary hook cooperating therewith to form stitches, a cutting wheel, means for actuating said wheel, a ring cooperating with said wheel to sever material and having a portion which encircles said rotary hook, and antifrictional means for rotatably supporting said ring, said supporting means including antifrictional elements engaging the inner periphery of said ring and a plurality of antifrictional elements engaging the outer periphery of said ring and located beneath the portion of the ring which encircles said hook.

16. A sewing machine having in combination a work-support, sewing instrumentalities including a reciprocatory needle located above said work-support and a loop-taker located below said work-support and cooperating with said needle to form stitches, a trimming mechanism comprising a rotary cutting member and a platen member cooperating therewith, one of said members being located above said work-support, the other of said members being located below said. work-support and encircling said loop-taker, means for supporting said last mentioned member including antifrictional elements located below said member and being disposed in substantially the same vertical plane as said members, and means for actuating one of said members.

JOHN D. KARLE. 

